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                Sgu395 Binary Cat Club                </h1>
                <p>时间限制：2s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p class="MsoNormal" style="text-indent: 20.25pt; text-align: left; "><b>学校电脑社进行了一次聚会，包了一个大厅唱<span lang="EN-US">KTV</span>。现在有关于这次聚会的<i style="mso-bidi-font-style:normal"><span lang="EN-US">N</span></i>条记录，每条记录的格式有<span lang="EN-US">+name</span>，<span lang="EN-US">-name</span>，<span lang="EN-US">=visitors</span>三种，分别表示进来一个叫&rdquo;<span lang="EN-US">name</span>&rdquo;的人，出去一个叫&rdquo;<span lang="EN-US">name</span>&rdquo;的人，当前聚会厅有<span lang="EN-US">visitors</span>个人。现在记录的一部分遗失，但剩下记录的顺序是原顺序。给出剩下的记录，请添加最少条数的记录，使之合理化。注意：可以有人进出会厅多次，可以有人聚会结束待在会厅。</b></p>
<p class="MsoNormal" style="text-align: left; "><span lang="EN-US" style="font-size:12.0pt;font-family:宋体;
mso-bidi-font-family:&quot;Times New Roman&quot;"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal" style="text-indent: 0px; text-align: left; "><b><br />
</b></p>
<p></p></p><hr/><h3>输入格式</h3><p><p class="MsoNormal" style="text-indent:20.25pt"><span style="font-size:12.0pt;
font-family:宋体">第一行一个数<span lang="EN-US">n</span>。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-indent:20.25pt"><span style="font-size:12.0pt;
font-family:宋体">接下来<span lang="EN-US">n</span>行，按顺序每行一条记录。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:宋体"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><b><br />
</b></p>
<p></p></p><hr/><h3>输出格式</h3><p><p class="MsoNormal"><b><br />
</b></p>
<p class="MsoNormal" style="text-indent: 23.25pt; "><span style="font-size: 12pt; font-family: 宋体; ">仅一行一个数，表示最小所需的费用。<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-indent: 23.25pt; "></p>
<p class="MsoPlainText" style="text-indent: 23.5pt; "></p>
<p></p></p><hr/><h3>样例输入</h3><pre>8

= 2

+ mt

- ljw

= 4

- zdy

- htx

+ sjf

= 10

 
</pre><hr/><h3>样例输出</h3><pre>19 

数据范围

1<=n<=200

每条= visitors记录中的visitors不超过100。

每个名字的长度不超过5，且都由小写字母组成；</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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